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Goniagnostus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Ptychagnostidae
Formal Genus Name and Reference:
Goniagnostus HOWELL, 1935c, p. 13
Type Species:
Agnostus nathorsti Brögger, 1878, p. 68, OD, holotype (BRÖGGER, 1878, pl. 5, fig. 1), not traced, PMO, Oslo
Images
(Click to enlarge in a new window)
Synonyms
Geographic Distribution
Sweden, T. fissus or A. atavus Zone; Sweden, Norway, Denmark, S. brachymetopa Zone; Australia (Queensland), A. atavus to A. cassis Zones, (Tasmania), A. cassis or P. agra Zone; Kazakhstan, A. atavus Zone, beds with Pianaspis recta; Russia (Siberian Platform), T. fissus, A. henrici, L. allachjunensis Zones, (Altay-Sayan), A. limbataeformis Zone; USA (Alaska), Bolaspidella Zone, (Utah), B. fimbriatus to B. contracta Subzones; China (Zhejiang, Hunan), P. atavus to L. armata Zones, (Guizhou), zone uncertain.
Age Range
Beginning Stage in Treatise Usage:
Middle Cambrian
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
0
Beginning Date:
512.3
Ending Stage in Treatise Usage:
lower Upper Cambrian
Ending International Stage:
Fraction Up In Ending Stage:
0
Ending Date:
493.4
Description
Usually scrobiculate, spinose, with or without cephalic spines and occipital spine, with axial spine and fulcral spines on the posterior thoracic segment and pygidial marginal spines. Anterior glabellar lobe depressed, subtriangular, posterior glabellar lobe broad, very strongly convex in posterior half, with F2 furrows very well developed, axial glabellar node located behind F1 furrows, basal lobes divided or entire, anterior extremities indistinct, associated with a well-developed apodemal pit. Pygidial axis with spine on M2 strongly deflecting F2 furrow rearward, posterior lobe with strong tubercle near midlength, centered on a variably developed rosette, median postaxial furrow well developed.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Ptychagnostidae
Formal Genus Name and Reference:
Goniagnostus HOWELL, 1935c, p. 13
Type Species:
Agnostus nathorsti Brögger, 1878, p. 68, OD, holotype (BRÖGGER, 1878, pl. 5, fig. 1), not traced, PMO, Oslo
Images
(Click to enlarge in a new window)Synonyms
Geographic Distribution
Sweden, T. fissus or A. atavus Zone; Sweden, Norway, Denmark, S. brachymetopa Zone; Australia (Queensland), A. atavus to A. cassis Zones, (Tasmania), A. cassis or P. agra Zone; Kazakhstan, A. atavus Zone, beds with Pianaspis recta; Russia (Siberian Platform), T. fissus, A. henrici, L. allachjunensis Zones, (Altay-Sayan), A. limbataeformis Zone; USA (Alaska), Bolaspidella Zone, (Utah), B. fimbriatus to B. contracta Subzones; China (Zhejiang, Hunan), P. atavus to L. armata Zones, (Guizhou), zone uncertain.
Age Range
Beginning Stage in Treatise Usage:
Middle Cambrian
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
0
Beginning Date:
512.3
Ending Stage in Treatise Usage:
lower Upper Cambrian
Ending International Stage:
Fraction Up In Ending Stage:
0
Ending Date:
493.4
Description
Usually scrobiculate, spinose, with or without cephalic spines and occipital spine, with axial spine and fulcral spines on the posterior thoracic segment and pygidial marginal spines. Anterior glabellar lobe depressed, subtriangular, posterior glabellar lobe broad, very strongly convex in posterior half, with F2 furrows very well developed, axial glabellar node located behind F1 furrows, basal lobes divided or entire, anterior extremities indistinct, associated with a well-developed apodemal pit. Pygidial axis with spine on M2 strongly deflecting F2 furrow rearward, posterior lobe with strong tubercle near midlength, centered on a variably developed rosette, median postaxial furrow well developed.